Mobile phone 5s can't receive calls, and can't receive text messages. What happened?

The phenomenon that mobile phone 5s can't receive calls and messages may be:

Individual phenomenon may be to blacklist contacts;

If they can't, they may have entered the flight mode or the SIM card is invalid or the network is invalid;

Neither can and it is possible that the operator stopped the service;

It is also possible that there is a problem with the network receiving module of the mobile phone;

The operator does not support SIM card;

The mobile phone is not activated, etc.